Performance of Foamed Asphalt under Repeated Load Axial Test

Foamed asphalt is a sustainable road material mixture in which the aggregates are normally mixed at ambient temperature, and the bitumen is created as a form of foam. In laboratory scale, the resistance to permanent deformation of road materials can be measured using Repeated Load Axial Test [RLAT]. This paper reports the results of laboratory testing using RLAT to evaluate the effect of foamed bitumen properties on the measured axial strain. Two types of aggregate gradation were evaluated using different testing modes. The specimens generated using 20 mm graded aggregate and using a 10 mm graded aggregate. The test results can be concluded that the effect of foam properties on the resistance to permanent deformation of a foamed asphalt material is less important than the effect of compaction characteristics (density or energy) or other parameters, e.g. aggregate skeleton.